Among the Believers

By

Jochen Bittner

Updated Sept. 21, 2007 12:01 a.m. ET

HAMBURG -- It had to be Fritz. A name can't get much more German than that. And of all places it had to happen in Sauerland, a remote region in Germany that invokes about as much the specter of a "parallel society" as a gardening club. The amount of explosives 28-year-old Fritz G., 22-year-old Daniel S. and Adem Y., a 28-year-old Turkish-German, had prepared in an inconspicuous vacation home would have been many times more destructive than the Madrid and London bombs.